We look at the division of 78675943 by 642 
We want to figure out the number of times 78675943 can be divided by 642.

Going ahead to step 1:
The number 642 fits into 7 0 times, leaving a remainder of 7.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 7 leaves us with 7.
Include the next digit (8) from the dividend after 7, then repeat: 78 / 642

On to step 2:
642 goes into 78 0 times with a remainder of 78.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 78 after subtracting 0 from 78.
Grab the next digit (6) from the dividend, add it to 78, then carry on: 786 / 642

Step 3:
786 divided by 642 is 1 with a remainder of 144.
The next digit of our result is 1. 
Result so far: 1.0
If we take 642 away from 786, we end up with 144.
Include the next digit (7) from the dividend after 144, then repeat: 1447 / 642

Moving on to step 4:
1447 divided by 642 is 2 with a remainder of 163.
Write down 2 as next digit of the result. 
Result so far: 12.0
Subtracting 1284 from 1447 leaves us with 163.
Fetch the next digit (5) from the dividend, attach it to 163 and continue: 1635 / 642

Let's proceed to step 5:
When dividing 1635 by 642, we get 2 with a remainder of 351.
The number 2 becomes the next digit in our result. 
Result so far: 122.0
If we take 1284 away from 1635, we end up with 351.
Take the next digit (9) from the dividend and append it to 351, then repeat: 3519 / 642

Going ahead to step 6:
The number 642 fits into 3519 5 times, leaving a remainder of 309.
Write down 5 as next digit of the result. 
Result so far: 1225.0
Deduct 3210 from 3519 and we're left with 309.
Grab the next digit (4) from the dividend, add it to 309, then carry on: 3094 / 642

Let's proceed to step 7:
When dividing 3094 by 642, we get 4 with a remainder of 526.
Put 4 as the next digit of the answer. 
Result so far: 12254.0
If we take 2568 away from 3094, we end up with 526.
Grab the next digit (3) from the dividend, add it to 526, then carry on: 5263 / 642

On to step 8:
642 can be fit into 5263 8 times, resulting in a remainder of 127.
The next digit of our result is 8. 
Result so far: 122548.0
Subtracting 5136 from 5263 leaves us with 127.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1270, and continue the process.

Let's proceed to step 9:
642 can be fit into 1270 1 times, resulting in a remainder of 628.
Write down 1 as next digit of the result. 
Result so far: 122548.1
The remainder is 628 after subtracting 642 from 1270.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6280, and continue the process.

Going ahead to step 10:
6280 divided by 642 is 9 with a remainder of 502.
Use 9 as the next digit of our solution. 
Result so far: 122548.19
Subtract 5778 from 6280 to get 502.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5020, and continue the process.

Advancing to step 11:
642 goes into 5020 7 times with a remainder of 526.
Use 7 as the next digit of our solution. 
Result so far: 122548.197
If we take 4494 away from 5020, we end up with 526.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5260, and continue the process.

Step 12:
5260 divided by 642 is 8 with a remainder of 124.
Put 8 as the next digit of the answer. 
Result so far: 122548.1978
Subtract 5136 from 5260 to get 124.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1240, and continue the process.

Let's proceed to step 13:
The number 642 fits into 1240 1 times, leaving a remainder of 598.
The number 1 becomes the next digit in our result. 
Result so far: 122548.19781
If we take 642 away from 1240, we end up with 598.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5980, and continue the process.

Moving on to step 14:
642 can be fit into 5980 9 times, resulting in a remainder of 202.
The number 9 becomes the next digit in our result. 
Result so far: 122548.197819
Subtracting 5778 from 5980 leaves us with 202.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2020, and continue the process.

Step 15:
2020 divided by 642 is 3 with a remainder of 94.
The next digit of our result is 3. 
Result so far: 122548.1978193
Subtract 1926 from 2020 to get 94.
Since there are no more digits in the dividend, we add a zero to the remainder making it 940, and continue the process.

On to step 16:
940 divided by 642 is 1 with a remainder of 298.
Put 1 as the next digit of the answer. 
Result so far: 122548.19781931
The remainder is 298 after subtracting 642 from 940.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2980, and continue the process.

The final outcome is 122548.19781931, with a leftover of 2.98e-07.